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Retirement Benefits (Plan Assets by Category and Fair Value Measurement Level) (Details) - Pension Benefits - USD ($) $ in Thousands | Dec. 30, 2022 | Dec. 31, 2021 | Dec. 25, 2020
--- | --- | --- | ---
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value, plan assets | $ 281,175 | $ 347,900 | $ 373,565
Investments categorized in fair value hierarchy |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value, plan assets | 32,514 | 31,229 |
Investments measured at net asset value |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value, plan assets | 248,661 | 316,671 |
Cash and cash equivalents | Level 1 | Fair Value, Recurring [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value, plan assets | 351 | 303 |
Insurance contract | Level 3 | Fair Value, Nonrecurring [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value, plan assets | 32,163 | 30,926 |
Equity | Fair Value, Recurring [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value, plan assets | 117,891 | 178,035 |
U.S. Large Cap | Fair Value, Recurring [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value, plan assets | 74,838 | 110,569 |
U.S. Small/Mid Cap | Fair Value, Recurring [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value, plan assets | 5,191 | 11,338 |
International | Fair Value, Recurring [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value, plan assets | 37,862 | 56,128 |
Fixed income | Fair Value, Recurring [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value, plan assets | 93,262 | 130,774 |
Real estate and other | Fair Value, Recurring [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value, plan assets | $ 37,508 | $ 7,862 |

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